NET INCOME PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Net income per common share:
Net income	$ 35,106	$ 3,281
Denominator for basic net income per share (weighted-average shares which reflect 509,242 shares in the treasury at January 31, 2021 and 2020)	7,977,683	8,005,927
Effect of dilutive securities from restricted stock plan and from dilutive effect of stock options	163,506	31,092
Denominator for diluted net income per share (adjusted weighted average shares)	8,141,189	8,037,019
Basic net income per share	$ 4.40	$ 0.41
Diluted net income per share	$ 4.31	$ 0.41